CN102917618A - Rolling body of a moving carriage cage for drawer guides - Google Patents

Abstract

Rolling body (1) of a moving carriage cage (2) for drawer guides (3), wherein the rolling body (1) has an internal core part (4) and a separate casing part (5) surrounding the core part (4), wherein the core part (4) is preferably composed of a first plastic, and the casing part (5) is preferably composed of a second plastic, wherein the plastics of the core part (4) and of the casing part (5) have different indentation hardnesses.

Description

Rolling elements for carriage cages of drawer guides

technical field

The invention relates to a rolling body for a carriage cage of a drawer guide. Furthermore, the invention relates to a carriage holder for a drawer guide having such rolling bodies, a drawer guide having a carriage holder and a piece of furniture having a drawer guide.

Background technique

Such rolling bodies essentially serve to transmit kinetic energy between the mostly metallic drawer rails. The rolling elements are mounted rotatably in a carriage cage arranged between the guide rails and must partially absorb the static load in the closed position of the drawer and ensure that the drawer is pulled as easily and effortlessly as possible during movement. into and out of the furniture body.

For example WO 2008/046118 discloses rolling elements in a carriage cage. The disadvantage of such a one-piece rolling element for the carriage cage is that the rolling element wears relatively quickly, is crushed under static load between the metallic drawer rails and often flakes off due to the manufacturing process.

Contents of the invention

It is therefore the object of the present invention to provide an improved rolling element or an improved carriage cage compared to the prior art. In particular, the strength of the rolling elements should be increased, the tendency to flattening should be reduced, the load support should be improved and the rolling elements should be given a certain degree of elasticity, and wear should be reduced.

This object is solved for a rolling element having the features of the preamble of claim 1 and a carriage cage having the features of the preamble of claim 13 in that the rolling element comprises an inner core and a A self-contained, wrapping kit surrounding a core. Owing to the two-part design of the rolling elements according to the invention, spalling which occurs during the hitherto customary one-piece production can be prevented, since the individual elements can now be produced more easily without pores. Furthermore, the individual elements, ie the core and the sheath, can be designed in a specific fit in the carriage holder.

Therefore, in a preferred embodiment of the invention it can be provided that the core and the cladding consist of different materials from one another, for example plastic and steel. The resulting loads can be ideally dissipated by the material of the rolling elements without causing unnecessary wear.

Alternatively, the core and the cladding can also be produced from the same plastic, but constructed separately. However, it can preferably be provided that, depending on the load and the magnitude of the tendency to crush, the core and the sheath are made of different types of plastic.

For this purpose, provision can be made particularly preferably for the plastics of the core and the sheath to have different Brinell hardnesses. These components with different Brinell hardnesses of the rolling elements significantly improve the properties of the overall carriage and enable a lighter and less-wearing drawer guide compared to the prior art.

Although there are usually two pieces in other kinds of pulleys (see AT 317 473, DE 41 08 884 A1, DE 41 04 271 A1, DE 26 02 979, DE 24 61 341 and DE 3922 716 A1), these pulleys are The size and mounting method must not be used in the carriage cage. In addition, the large pulleys known from the prior art do not have a shaftless, substantially solid cylindrical core and therefore cannot be used in carriage cages. Furthermore, these other types of rollers always form part of the drawer guide as individual, highly loaded rollers, whereas the rolling elements according to the invention are usually arranged in a combination of several rolling elements in the carriage cage. Changes in the characteristics of the rolling elements (two-part) thus affect the sliding and pulling-out behavior of the drawer in a completely different way, since in combination eg crushing tendencies and load support are distributed over several rolling elements.

Since the core according to a preferred embodiment of the invention is substantially configured as a solid cylinder, a significant quality improvement can be achieved by, inter alia, producing the core as a compact plastic part without the need for recesses or holes for the shaft pins , pivot pins are necessary in other types of prior art. In other types of prior art, the core is always configured as a hollow cylinder, not as a solid cylinder, so in a preferred rolling element of the present invention, the core is positioned close to the radial direction of the wrapper. The inner surface (that is to say within the wrapping) extends as far as the imaginary axis of the rolling body. Based on this compactness of the core, primarily a better stability of the entire rolling element is achieved, since such a compact core suffers less crushing or is comparable to an annular core with axial notches that reduce stability Better export of bruises.

According to a preferred embodiment of the invention it can be provided that the core has a greater Brinell hardness than the sheath, wherein the first plastic has a Brinell hardness of greater than 125 N/mm ² , preferably greater than 140 N/mm ² And the second plastic has a Brinell hardness of less than 105 N/mm ² , preferably less than 90 N/mm ² . In this so-called hard-inside-soft-outside rolling element, the sheath remains essentially unreinforced, while the following characteristics are produced in the reinforced core: reduced wear, increased strength and plastic in the closed state under static load. Creep reduction.

According to an alternative embodiment of the invention it can be provided that the sheath has a greater Brinell hardness than the core, wherein the second plastic has a Brinell hardness of greater than 125 N/mm ² , preferably greater than 140 N/mm ² Hardness and the first plastic has a Brinell hardness of less than 105 N/mm ² , preferably less than 90 N/mm ² . The following advantageous features result in such rolling elements with reinforced wrappings and relatively soft cores (hard on the outside and soft on the inside): significantly reduced flattening, load support of the wrappings and increased elasticity of the rolling elements.

For different types of plastics it can preferably be provided that one plastic is polyoxymethylene (POM) with a Brinell hardness of 150 to 170 N/mm ² and one plastic is polyamide with a Brinell hardness of 65 to 80 N/mm ² , preferably PA6. The two plastic types can therefore be used in different positions depending on the purpose of use and the type of loading of the rolling elements in the carriage cage.

Additional differences are listed below, which constitute important criteria for the use of the plastics mentioned as rolling elements:

POM PA6 Elastic Modulus 2800－3200N/ ^mm2 1400－3200N/ ^mm2 density 1.41-1.43g/ ^cm3 1.13-1.14g/ ^cm3 elongation at break 45-70% 45-150% breaking strength or yield stress 70-80N/ ^mm2 45-65N/ ^mm2

Brinell hardness (also known as ball pressure hardness) basically determines the deformation component of the plastic's viscoelasticity. If the indenter used in the test method is unloaded during the hardness test of the plastic, the deformed elastic part returns immediately, the viscoelastic part then returns gradually. The indentation body is therefore loaded for a certain period of time in the hardness measurement of the plastic and the entire elastic and viscoelastic indentation depth is measured under load. The ball pressure test to be introduced to determine the parameters mentioned should be based on DIN EN ISO 2039-1.

According to a preferred embodiment of the invention it can be provided that the rolling bodies are produced by two-component injection molding. This production method avoids the flaking that has often occurred so far, since the two components remain substantially free of pores during injection molding of the two components, which would otherwise cause flaking later. Shrink-fitting of the pack onto the core also creates a tighter connection between these two components of the rolling elements. The production of, for example, the core itself in this preferred two-component injection molding method should not be excluded. Alternatively, it should also not be ruled out to extrude the two plastic elements and to cut them off to certain rolling body widths after extrusion. As a further alternative, the two elements of the rolling bodies can also only be assembled when the carriage cage is installed in the drawer guide.

In order to achieve rotatability and guidance of the rolling elements in the carriage cage due to their shaftless nature, it can preferably be provided that the rolling elements have two end faces in which guide projections or guide depressions are formed. , and the guide protrusion or the guide recess is less than 20%, preferably less than 10%, of the width of the rolling body in the axial direction protruding from or extending into the rolling body.

Since the rolling bodies according to the invention usually also have to withstand high loads during the movement of the drawer, it is preferably provided that the width of the rolling bodies is greater than the diameter of the rolling bodies. In this case, the ratio of the width of the rolling elements to the diameter of the rolling elements is between 1.01:1 and 1.8:1, preferably between 1.05:1 and 1.35:1. Alternatively, it should not be ruled out that the width of the rolling bodies is smaller than the diameter of the rolling bodies. This can be advantageous primarily when two or more such rolling bodies are arranged coaxially one behind the other in the carriage cage.

Preferred dimensions of the rolling body according to the invention are given in claim 12, wherein the diameter of the rolling body is between 1 and 8 mm, preferably between 3 and 6.5 mm, and the thickness of the sheath transversely to the rolling body axis is between Between 0.1 and 2.5 mm, preferably between 0.2 and 0.5 mm.

A preferred embodiment of the invention can provide that a reinforcement layer made of glass fibers is arranged in the rolling body. Furthermore, it should not be ruled out that a narrow pivot pin is embodied in the rolling bodies, despite the above-mentioned advantages of the core as a solid cylinder.

A preferred embodiment of the carriage cage according to the invention can provide that all rolling bodies mounted rotatably in the carriage cage comprise a core made of a first plastic and a core made of a second plastic. A complete package, wherein the plastics of the core and package have different Brinell hardness. Depending on the location of use and the load range, the individual rolling elements can have different plastics with different Brinell hardness or different plastic types. In general, the same preferred embodiments as for the rolling bodies also apply to the carriage cage.

Furthermore, it can preferably be provided that guide projections or guide recesses are formed in the end faces of the rolling bodies and that the carriage cage has a housing provided with receptacles for the rolling bodies, which housing has retaining recesses in the receptacles. The rolling element is rotatably supported by a guide protrusion or a guide recess and is held on the retaining recess or retaining protrusion.

A drawer guide according to claim 19 and a piece of furniture according to claim 20 are also claimed.

Description of drawings

Further details and advantages of the invention are explained below with reference to the description of the drawings with reference to the exemplary embodiment shown in the drawings. in:

Figure 1 shows a longitudinal sectional view of a pulley according to the prior art;

Figure 2 shows a longitudinal section view of a rolling element according to the invention;

Fig. 3 shows a longitudinal sectional view of a rolling body with guide depressions;

FIG. 4 shows a longitudinal sectional view of a rolling body with guide lugs;

Fig. 5 shows a 3D diagram of a rolling body;

Figure 6 shows a cross-sectional view of a rolling element;

Figure 7 shows an exploded view of the slide holder;

Figure 8 shows a carriage cage with installed rolling elements;

Figure 9 shows a slide cage with section A-A;

Figure 10 shows a slide holder with section BB;

Figure 11 shows a rolling element with section CC;

Figure 12 shows an exploded view of the drawer guide;

Figure 13 shows the assembled drawer guide;

FIG. 14 shows a piece of furniture with drawers guided on drawer guides.

Detailed ways

FIG. 1 shows a relatively large pulley 31 according to the prior art (with a diameter of about 1.5 cm), which can be used, for example, as individual guide wheels for drawer rails in body rails. It is known here that a cladding 35 and a core 34 are made of different plastics. Furthermore, these pulleys 31 according to the prior art are complicated by the fact that axial recesses 33 always have to be provided for pivot pins 32 via which the wheels are mounted, for example rollably, on the drawer rail.

In contrast, FIG. 2 shows how an embodiment of a rolling element 1 according to the invention has a compact, shaftless core 4 in the form of a solid cylinder, which is comprised of a wrapping 5 comprising a A pack 5 different from the core 4 and having a different Brinell hardness. This preferred two-component injection molding production of the rolling bodies 1 (and/or only the core 4 ) results in a considerable increase in quality, since no pores (air inclusions) occur. Here, for example, an inner core 4 with a diameter d of approximately 1.5 to 4 mm can be injection molded in a first step. In a second step, the inner core 4 is then injection-molded with an outer core 4 of the same material to a total diameter of approximately 3 to 7 mm. This results in a longer service life and increased strength of the two-component core 4 and/or the two-component rolling bodies 1 . Compared to the cladding 5 , the thickness of the core 4 can vary significantly with respect to the embodiment in FIG. 2 . It is important for functionality that the width b of the rolling body 1 measured in the direction of the axis x is greater than the diameter d of the rolling body 1 .

FIGS. 3 and 4 show mutually alternative embodiments of the rolling bodies 1 , on the one hand, a guide recess 8 with a recessed depth a that can be used as a holding or guiding device for the rolling bodies 1 on the carriage cage 2 On the one hand, on the other hand, in the opposite embodiment, a guide bead 7 with a bead width a can be formed on the rolling body 1 .

FIG. 5 shows a 3D view of the rolling body 1 , in which a guide recess 8 is formed in the region of the core 4 , which is surrounded by a substantially circular guide bead 7 . The guide lugs 7 have chamfered sides, which facilitate the installation of the rolling bodies 1 into the receiving chambers 10 formed in the carriage cage 2 and provided with the retaining lugs 12 .

FIG. 6 shows a cross section of a rolling body 1 , wherein the sheath thickness c can preferably be between 0.1 and 0.7 mm.

FIG. 7 shows an exploded view of the carriage cage 2 , which comprises an injection-molded housing 9 , preferably made of plastic, and rolling elements 1 as essential components. Receptacles 10 for the rolling bodies 1 are formed at various points in the housing 9 , into which holding lugs 12 protrude and on which the rolling bodies 1 are held via the guide recesses 8 . In this case, the retaining projection 12 serves essentially only to prevent the rolling element 1 , which is only loosely mounted in the receptacle 10 , from falling out during assembly of the drawer guide. A carriage damper 16 can be arranged at the end of the carriage holder 2 . In FIG. 8 , the rolling body 1 is arranged in the receiving chamber 10 .

FIG. 9 shows a side view of the carriage cage 2 with section A-A, in which it can be seen that a plurality of rolling bodies 1 pass through the holding projections 12 or the guide recesses 8 in the housing 9 of the carriage cage 2 be kept. FIG. 10 shows a plan view of the carriage cage 2 with section BB. FIG. 11 shows a view of the end face 6 of the rolling body 1 , the two-part rolling body 1 (core 4 and wrapping 5 ) can be seen in section CC.

Fig. 12 shows the main components of the drawer guide 3 in an exploded view, including a guide rail part 13 in the form of a body guide rail, a guide rail part 14 in the form of a middle guide rail, a drawer guide rail 17 and a guide rail 13 arranged on the body guide rail 13 and the middle guide rail Carriage cage 2 with rolling elements 1 between 14. In addition, the drawer guide 3 may also include a push-out device 19 , a pull-in device 18 and various other elements 20 . In FIG. 13 the individual components of FIG. 12 are visible in an assembled state.

Finally, FIG. 14 shows a piece of furniture 15 comprising a plurality of drawers 21 which can be moved in and out in a furniture body 22 by means of a drawer guide 3 according to the invention.

Claims (20)

1. be used for the rolling element (1) of the slide retainer (2) of drawer guiding device (3), it is characterized in that, described rolling element comprise one be positioned at inner chipware (4) and one independently, the jacket spare (5) of encirclement chipware (4).

2. rolling element according to claim 1 is characterized in that, described chipware (4) and described jacket spare (5) are made by the material that differs from one another, for example plastics and steel.

3. rolling element according to claim 1 is characterized in that, described chipware (4) and described jacket spare (5) are made by dissimilar plastics.

4. rolling element according to claim 3 is characterized in that, described chipware (4) has different Brinell hardness with the plastics of described jacket spare (5).

5. according to claim 1 to one of 4 described rolling elements, it is characterized in that, described chipware (4) is configured to solid cylinder basically.

6. according to claim 1 to one of 5 described rolling elements, it is characterized in that, described chipware (4) extends until the imaginary axis (x) of described rolling element (1).

7. according to claim 4 to one of 6 described rolling elements, it is characterized in that, described chipware (4) has than the larger Brinell hardness of described jacket spare (5), and wherein, the first plastics have the 125N/mm of being higher than ², preferably be higher than 140N/mm ²Brinell hardness and the second plastics have the 105N/mm of being lower than ², preferably be lower than 90N/mm ²Brinell hardness.

8. according to claim 4 to one of 6 described rolling elements, it is characterized in that, described jacket spare (5) has than the larger Brinell hardness of described chipware (4), and wherein, the second plastics have the 125N/mm of being higher than ², preferably be higher than 140N/mm ²Brinell hardness and the first plastics have the 105N/mm of being lower than ², preferably be lower than 90N/mm ²Brinell hardness.

9. according to claim 3 to one of 8 described rolling elements, it is characterized in that, described rolling element (1) is made with the bicomponent injection molding method.

10. according to claim 1 to one of 9 described rolling elements, it is characterized in that, described rolling element (1) has two end faces (6), is configured with guide protrusion part (7) or guiding depressed part (8) in described end face (6).

11. rolling element according to claim 10, it is characterized in that, described guide protrusion part (7) or guiding depressed part (8) on axis (x) direction less than rolling element (1) width (b) 20%, preferably stretch out or stretch into the rolling element (1) from rolling element (1) less than 10% ground.

12. to one of 11 described rolling elements, it is characterized in that according to claim 1, the width (b) of described rolling element (1) is greater than the diameter (d) of described rolling element (1).

13. rolling element according to claim 12 is characterized in that, the ratio of the width (b) of described rolling element (1) and the diameter (d) of described rolling element (1) is between 1.01 to 1 to 1.8 to 1, preferably between 1.05 to 1 to 1.35 to 1.

14. according to claim 1 to one of 13 described rolling elements, it is characterized in that, the diameter (d) of described rolling element (1) is between 1.5 to 8mm, preferably between 3.5 to 6.5mm, described jacket spare (5) transverse to the thickness (c) of described rolling element (1) axis (x) between 0.2 to 2.5mm.

15. be used for the slide retainer (2) of drawer guiding device (3), comprise a plurality of especially according to claim 1 to one of 12 described rolling elements (1), described rolling element can be rotated to support in the slide retainer (2), it is characterized in that, described rolling element have one be positioned at inner chipware (4) and one independently, the jacket spare (5) of encirclement chipware (4).

16. slide retainer according to claim 15, it is characterized in that, described chipware (4) is made by the first plastics, and described jacket spare (5) is made by the second plastics, wherein, described chipware (4) has different Brinell hardness with the plastics of jacket spare (5).

17. slide retainer according to claim 16, it is characterized in that, all rolling elements (1) rotatably mounted in slide retainer (2) comprise a chipware of being made by the first plastics (4) and a jacket spare of being made by the second plastics (5), wherein, described chipware (4) has different Brinell hardness with the plastics of jacket spare (5).

18. according to claim 15 to one of 17 described slide retainers, it is characterized in that, in the end face of rolling element (1), be configured with guide protrusion part (7) or guiding depressed part (8), and slide retainer (2) has a housing (9) that is provided with for the container cavity (10) of rolling element (1), wherein, this housing (9) has maintenance recess (11) or keeps protuberance (12) in container cavity (10), rolling element (1) is rotatably mounted and remain on described maintenance recess or the maintenance protuberance by guide protrusion part (7) or guiding depressed part (8).

19. have according to claim 15 to the drawer guiding device (3) of one of 18 described slide retainers (2), wherein, described slide retainer (2) is arranged between the track segment that can move relative to each other (13,14) of drawer guiding device (3).

20. have the furniture (15) of drawer guiding device according to claim 19 (3).

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